An analysis of causes of dispersions in the results of geomaterial tests

Kazuaki Hioki, Kenta Hattori, Kohei Sawa, Yoshihisa Nakayama, Shinya Inazumi

Research output: Contribution to journalArticlepeer-review


In this study, an analysis was made of the causes of variations in the results of Particle size distribution test (sedimentation analysis), liquid limit test, plastic limit test and unconfined compression test in which the coefficient of variation was nearly 5% or higher during proficiency testing of geomaterial tests. The analysis was made based on the results of a questionnaire survey conducted at the same time as the proficiency testing. As a result, it was verified that not only the experience of test engineers but also complying with standards, and checking, inspecting and correcting test apparatuses and measuring instruments are important to the improvement of the accuracy of geomaterial tests. It was also revealed that the maximum and minimum weights measured by a balance scale affect test accuracy.

Original languageEnglish
Pages (from-to)84-89
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Issue number1
Publication statusPublished - 2016 Jan
Externally publishedYes


  • Liquid limit test
  • Particle size distribution test
  • Plastic limit test
  • Proficiency testing
  • Unconfined compression test

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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